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MPC8270 PCI Bridge Configuration Register offset 0x40 and 0x98

Question asked by Christian Reedy on Apr 22, 2016
Latest reply on Apr 25, 2016 by Bulat Karymov

While making modifications to legacy software we have found writes to reserved/undocumented registers.  Maybe these are from an early datasheet or errata?

 

Both writes are to the host PCI configuration space (bus=0, dev=0, fxn=0)

// PCI Bridge Option

0x40 = 0x00000004;

 

// PCI PIMOSA

 

0x98 = 0xC0000003;


Does anyone recognize what these register writes are doing?

Thanks,

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